Hybrid threading tool with cutting portion and rolling portion
AssigneeGM Global Technology Operations LLC
InventorsDavid A. Wulbrecht, Qigui Wang, Tiruttani Munikamal, Lokesh Choudhary
Life of this patent
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Abstract
A hybrid threading tool defines a longitudinal axis and includes a cutting portion with a plurality of cutting teeth. The plurality of cutting teeth are configured to cut a first threading into a workpiece. The hybrid threading tool also defines a forming portion that is attached to the cutting portion and that is arranged therewith along the longitudinal axis. The forming portion includes a plurality of forming teeth configured to plastically deform the first threading into a second threading for the workpiece.
Claims20
A hybrid threading tool that defines a longitudinal axis comprising:
- a cutting portion with a first end and a second end spaced apart along the longitudinal axis, the cutting portion including a plurality of cutting teeth, the plurality of cutting teeth configured to cut a first threading into a workpiece;
- a forming portion with a third end and a fourth end spaced apart along the longitudinal axis, the third end being attached to the second end of the cutting portion at a junction, the forming portion arranged with the cutting portion along the longitudinal axis, the forming portion including a plurality of forming teeth configured to plastically deform the first threading into a second threading for the workpiece;
- and
- wherein the cutting portion and the forming portion have different material characteristics that are different at the junction.
A hybrid threading tool for threading a main bearing bolt hole of an engine block, the threading tool defining a longitudinal axis and comprising:
- a cutting portion with a first end and a second end spaced apart along the longitudinal axis, the cutting portion including a plurality of cutting teeth, the cutting portion being tapered, the plurality of cutting teeth configured to cut a first threading into the main bearing bolt hole at a first major diameter;
- a forming portion with a third end and a fourth end spaced apart along the longitudinal axis, the third end being attached to the second end of the cutting portion at a junction, the forming portion arranged with the cutting portion along the longitudinal axis, the forming portion including a plurality of forming teeth configured to plastically deform the first threading into a second threading for the main bearing bolt hole, the second threading having a second major diameter, the first major diameter being, at most, ninety-five percent (95%) of the second major diameter;
- and
- wherein the cutting portion and the forming portion have different material characteristics that are different at the junction, the cutting portion having higher hardness than the forming portion and the forming portion having higher material toughness than the cutting portion.
Dependencies are inferred from the claim text.